Actually, if it's considered normal then it's exactly what the car was designed to do. It may not be what other cars were designed to do, but that doesn't make it 'not-normal', only 'designed-differently'. I may not like the sound symposer on the FiST compared to the FoST, but just because they're designed differently doesn't make the the FiST 'not-normal'.Sorry...i can check our lot for budget cars which we have. My own Mazda CX-9 doesn't do it either. Like I said....it may be considered "normal" but that doesn't mean that that is what the car was supposed to do.
OP-I just went out and tried this on both my FiST and FoST, both cars were set to off when I started them so that was their last position, and neither of them did it. With that being said, both cars are set to 69 degrees and ambient temp is 68, and I believe that the close proximity in temperatures is what leads to nothing drastic occurring. I know I've had it happen with both ST's, and I seem to remember it as a characteristic of both of my '12 Mk3 Focuses. I'm pretty sure that if I try it later in the day when it's warmer that I will get the blast of air.
With that being said, this is a ridiculous gripe in the grand scheme of things. There are people concerned with failing engines, transmissions, brakes, oil in their charge pipes/intake, etc, and your worst problem is a few seconds of air blasted in your face that is rectified by taking a split second to reach up with both hands and shut vents prior to turning the system on-it's not like you don't know what's about to happen. There are numerous ways already mentioned in which you could alleviate the specific issue, but your refusal to do them doesn't mean that Ford should redesign the system.
Nonetheless, I hope you can get some resolution. I'm sure someone would love to have a reduced cost on buying a FiST that was condemned for environmental controls as opposed to a car that consistently overheated or any other legitimately worrisome complaint.